// Load the Auth_model
$this->load->model('Auth_model');

// Register a new user
$user_data = array(
    'username' => 'example_user',
    'email' => '[email protected]',
    'password' => 'secure_password'
);
$user_id = $this->Auth_model->register_user($user_data);

// Login a user
$username = 'example_user';
$password = 'secure_password';
$login_successful = $this->Auth_model->login_user($username, $password);

// Reset user password
$email = '[email protected]';
$password_reset_successful = $this->Auth_model->reset_password($email);

// Logout user
$this->Auth_model->logout_user();